iOS 11 - 添加代理后未收到位置更新

Question

我一直在iOS 11中的“允许使用”和“始终允许”位置服务遇到问题。 iOS中的问题没有问题< 11.在尝试修复时遵循此thread，但仍然无效。我错过了什么？先谢谢你。

1. 我在我的应用程序UITabViewController和UINavigationController每个选项卡内。
2. 我有一个singleton LocationManager类。我将我的UINavigationController的RootViewController设置为委托ViewController的viewWillAppear来接收位置更新并在viewWillDisappear中删除。
3. 现在，当我启动应用程序时，在创建标签栏之前，我可以看到LocationManager类中正在调用位置更新。
4. 但是，当我添加我的UIViewController作为委托，并给startUpdatingLocation我没有收到我的UIVIewController中的位置更新。
5. 然后我按Home按钮并退出应用程序。再次立即启动应用程序，我得到我的委托方法中的位置更新。

我在Info.plist文件中添加了全部三个位置授权说明。

的Info.plist：

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key> 
<string>Blah Blah Blah</string> 
<key>NSLocationAlwaysUsageDescription</key> 
<string>Blah Blah Blah</string> 
<key>NSLocationWhenInUseUsageDescription</key> 
<string>Blah Blah Blah</string> 

LocationController.m：

#import "LocationController.h" 

//static int LOCATION_ACCESS_DENIED = 1; 
//static int LOCATION_NETWORK_ISSUE = 2; 
//static int LOCATION_UNKNOWN_ISSUE = 3; 
enum { 
    LOCATION_ACCESS_DENIED = 1, 
    LOCATION_NETWORK_ISSUE = 2, 
    LOCATION_UNKNOWN_ISSUE = 3 
}; 

static LocationController* sharedCLDelegate = nil; 

@implementation LocationController 
int distanceThreshold = 10.0; // in meters 
@synthesize locationManager, currentLocation, locationObservers; 

- (id)init 
{ 
    self = [super init]; 
    if (self != nil) { 
     self.locationManager = [[CLLocationManager alloc] init]; 
     self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
     self.locationManager.distanceFilter = distanceThreshold; 
     self.locationManager.pausesLocationUpdatesAutomatically = NO; 
     [self.locationManager startMonitoringSignificantLocationChanges]; 
     self.locationManager.delegate = (id)self; 
     if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { 
      [self.locationManager requestWhenInUseAuthorization]; //I tried both commenting this line and uncommenting this line. Didn't make any difference 
     } 
     if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) 
     { 
      [self.locationManager requestAlwaysAuthorization]; 
     } 
     [self.locationManager startUpdatingLocation]; 
     [self.locationManager startUpdatingHeading]; 
     locationObservers = [[NSMutableArray alloc] init]; 

    } 
    return self; 
} 

#pragma mark - 
#pragma mark CLLocationManagerDelegate Methods 

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 
{ 
    NSLog(@"locationManager didUpdateLocations = %@",locations); 
    CLLocation *newLocation = [locations lastObject]; 
    if (newLocation.horizontalAccuracy < 0) { 
     return; 
    } 
    currentLocation = newLocation; 

    for(id<LocationControllerDelegate> observer in self.locationObservers) { 
     if (observer) { 
//   CLLocation *newLocation = [locations lastObject]; 
//   if (newLocation.horizontalAccuracy < 0) { 
//    return; 
//   } 
//   currentLocation = newLocation; 

      NSTimeInterval interval = [currentLocation.timestamp timeIntervalSinceNow]; 
      //check against absolute value of the interval 
      if (fabs(interval)<30) { 
       [observer locationUpdate:currentLocation]; 
      } 

     } 
    } 
} 

- (void)locationManager:(CLLocationManager*)manager 
     didFailWithError:(NSError*)error 
{ 
    NSLog(@"locationManager didFailWithError: %@", error); 

    for(id<LocationControllerDelegate> observer in self.locationObservers) { 
     if (observer) { 
      [observer failedToGetLocation:error]; 
     } 
    } 
    switch (error.code) { 
     case kCLErrorDenied: 
     { 
      break; 
     } 
     case kCLErrorNetwork: 
     { 
      break; 
     } 
     default: 

      break; 
    } 


} 

#pragma mark - Singleton implementation in ARC 
+ (LocationController *)sharedLocationInstance 
{ 
    static LocationController *sharedLocationControllerInstance = nil; 
    static dispatch_once_t predicate; 
    dispatch_once(&predicate, ^{ 
     sharedLocationControllerInstance = [[self alloc] init]; 
    }); 
    return sharedLocationControllerInstance; 
} 

-(void) locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status { 
    NSLog(@"didChangeAuthorizationStatus = %i",status); 
    if (status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse) { 
     [self.locationManager stopUpdatingLocation]; 
     [self.locationManager startUpdatingLocation]; 
    } 
} 
- (void) addLocationManagerDelegate:(id<LocationControllerDelegate>)delegate { 
    if (![self.locationObservers containsObject:delegate]) { 
     [self.locationObservers addObject:delegate]; 
    } 
    [self.locationManager startUpdatingLocation]; 
} 

- (void) removeLocationManagerDelegate:(id<LocationControllerDelegate>)delegate { 
    if ([self.locationObservers containsObject:delegate]) { 
     [self.locationObservers removeObject:delegate]; 
    } 
} 

+ (id)allocWithZone:(NSZone *)zone { 
    @synchronized(self) { 
     if (sharedCLDelegate == nil) { 
      sharedCLDelegate = [super allocWithZone:zone]; 
      return sharedCLDelegate; // assignment and return on first allocation 
     } 
    } 
    return nil; // on subsequent allocation attempts return nil 
} 

- (id)copyWithZone:(NSZone *)zone 
{ 
    return self; 
} 

#pragma mark UIAlertViewDelegate Methods 

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { 
    switch (alertView.tag) { 
     case LOCATION_ACCESS_DENIED: 
     { 
      if (buttonIndex == 1) { 

       //[[UIApplication sharedApplication] openURL: [NSURL URLWithString: UIApplicationOpenSettingsURLString]]; 
       [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"]]; 

      } 


     } 
     break; 
     case LOCATION_NETWORK_ISSUE: 
      break; 
     case LOCATION_UNKNOWN_ISSUE: 
      break; 
     default: 
      break; 
    } 
    [alertView dismissWithClickedButtonIndex:buttonIndex animated:YES]; 
} 
@end 

LocationController.h

#import <UIKit/UIKit.h> 
#import <CoreLocation/CoreLocation.h> 
#import <Foundation/Foundation.h> 

// protocol for sending location updates to another view controller 
@protocol LocationControllerDelegate 
@required 
- (void)locationUpdate:(CLLocation*)location; 
- (void)failedToGetLocation:(NSError*)error; 
@end 

@interface LocationController : NSObject<CLLocationManagerDelegate,UIAlertViewDelegate> 


@property (nonatomic, strong) CLLocationManager* locationManager; 
@property (nonatomic, strong) CLLocation* currentLocation; 
@property (strong, nonatomic) NSMutableArray *locationObservers; 


+ (LocationController*)sharedLocationInstance; // Singleton method 

- (void) addLocationManagerDelegate:(id<LocationControllerDelegate>) delegate; 
- (void) removeLocationManagerDelegate:(id<LocationControllerDelegate>) delegate; 


@end 

ViewController.m

- (void) viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:animated]; 
    NSLog(@"VC viewWillAppear"); 
    [locationControllerInstance addLocationManagerDelegate:self]; 
} 

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    [LocationController sharedLocationInstance]; 
} 

Answer 1

我有了新的设备的一个报道这个问题，因为你知道外景经理通常称此：

- （void）mapView：（MKMapView *）mapView didUpdateUserLocation：（MKUserLocation *）userLocation

的奇怪的事情是，用户位置对象包含两个坐标对象：

1）userLocation.location.coordinate：这用来做工精细，但由于某种原因它在某些设备上IOS11返回NULL（它是不知道为什么自IOS11以来这是行为的）。

2）userLocation.coordinate：这是另一个（相同）对象，你可以从属性中看到它，它具有位置数据，并继续与IOS11一起正常工作，这似乎没有被破坏（还）。

所以，用上面的例子， “我猜”，你的：

• （无效）的LocationManager：（CLLocationManager *）经理didUpdateLocations：（NSArray的*）位置

可能会遇到同样的问题（即数组可能在位置对象的某个位置返回空值，但不是坐标对象，我一次只获取一个位置的代码所做的解决方案现在可以通过替换userLocation .location.coor dinate与userLocation.coordinate，并且问题消失了。

我也粘贴下面的函数来进一步帮助你，希望它能帮助你解决你的问题，注意到我有两个条件用于测试一个用于获取位置对象，另一个用于获取坐标对象，一个用于测试现在罚款，对方似乎在IOS11被打破：

-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
{ 
    Log (4, @"MapView->DidUpdateUL - IN"); 

    if (_OrderStartTrackingMode == enuUserMapTrackingMode_User) 
    { 
     if (userLocation) 
     { 
      if (userLocation.location) 
      { 
       if ((userLocation.location.coordinate.latitude) && (userLocation.location.coordinate.longitude)) 
       { 
        [_mapLocations setCenterCoordinate:userLocation.location.coordinate animated:YES]; 
       } else { 
        if ((userLocation.coordinate.latitude) && (userLocation.coordinate.longitude)) 
        { 
         [self ShowRoutePointsOnMap:userLocation.coordinate]; 
        } 
       } 
      } 
     } 

    } else if (_OrderStartTrackingMode == enuUserMapTrackingMode_Route) { 

     if (userLocation) 
     { 
      if ((userLocation.coordinate.latitude) && (userLocation.coordinate.longitude)) 
      { 
       [self ShowRoutePointsOnMap:userLocation.coordinate]; 
      } 
     } 


    } 

    Log (4, @"MapView->DidUpdateUL - OUT"); 
} 

不用说了，你检查你的设置Map对象，你至少应该有“用户位置”已启用：

P.S.上面代码中的Log函数是NSLog函数的一个包装，因为我也使用它来写入文件。

祝你好运乌玛，让我知道它是怎么回事。

问候，海德